Adding WICG CompressionStream API to externs.
Adding WICG CompressionStream API to externs.

PiperOrigin-RevId: 353300080

ChadKillingsworth/closure-compiler,ChadKillingsworth/closure-compiler,google/closure-compiler,google/closure-compiler,monetate/closure-compiler,ChadKillingsworth/closure-compiler,monetate/closure-compiler,vobruba-martin/closure-compiler,vobruba-martin/closure-compiler,vobruba-martin/closure-compiler,ChadKillingsworth/closure-compiler,nawawi/closure-compiler,monetate/closure-compiler,google/closure-compiler,vobruba-martin/closure-compiler,monetate/closure-compiler,nawawi/closure-compiler,nawawi/closure-compiler,nawawi/closure-compiler,google/closure-compiler